#1F3188#1F3188

#1F3188 is a dark, vivid blue. Relative luminance 0.043; OKLCH L 35.9% C 0.146 H 268.7°. Best body text is #FFFFFF at 11.33:1 contrast (WCAG AA passes).

Color values

HEX	#1F3188
RGB	rgb(31, 49, 136)
HSL	hsl(230, 63%, 33%)
HSV	hsv(230, 77%, 53%)
CMYK	cmyk(77.2%, 64%, 0%, 46.7%)
CIE-LAB	lab(24.53, 25.56, -50.58)
CIE-LCH	lch(24.53, 56.67, 296.81°)
OKLab	oklab(35.93% -0.0034 -0.1462)
OKLCH	oklch(35.93% 0.146 268.7)
XYZ	xyz(6.1058, 4.2648, 23.7892)
Luminance	0.0427 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F3188 #88761F

analogous

#1F6688 #1F3188 #411F88

triadic

#1F3188 #881F31 #31881F

tetradic

#1F3188 #881F66 #88761F #1F8841

square

#1F3188 #881F66 #88761F #1F8841

split-complementary

#1F3188 #88411F #66881F

monochromatic

#080D24 #141F56 #1F3188 #2A43BA #4B63D6

Accessibility & contrast

On white

11.33

#1F3188 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.85

#1F3188 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F3188

11.33:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F3188	#FFFFFF	#000000	##FFFFFF
##1F3188	1.00	11.33	1.85	11.33
#FFFFFF	11.33	1.00	21.00	1.00
#000000	1.85	21.00	1.00	21.00
##FFFFFF	11.33	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003F8B

Deuteranopia (green-blind)

#003586

Tritanopia (blue-blind)

#004757

Achromatopsia (no color)

#3A3A3A

Design tokens & code

CSS

--color: #1f3188;
/* rgb */ color: rgb(31, 49, 136);
/* oklch */ color: oklch(35.9% 0.146 268.7);

Tailwind

colors: {
  custom: {
    50: '#6c69ac',
    500: '#1f3188',
    950: '#000000',
  },
}

SCSS

$custom: #1f3188;
$custom-light: #6c69ac;
$custom-dark: #000000;

JSON

{
  "hex": "#1f3188",
  "rgb": {
    "r": 31,
    "g": 49,
    "b": 136
  },
  "hsl": {
    "h": 229.714,
    "s": 62.874,
    "l": 32.745
  },
  "oklch": {
    "l": 0.35933,
    "c": 0.14624,
    "h": 268.7
  },
  "luminance": 0.04266
}

Semantic roles & 50–950 ramp

primary

#1F3188

secondary

#B9A64A

accent

#CA42E6

background

#F7F6FA

surface

#EDEBF4

border

#C8C6CE

text

#080610

muted

#7B7A7F

Preview Lab

Preview with #1F3188

Body copy rendered with the generated semantic roles for this colour.

Preview Lab → · Contrast checker → · Palette generator →